Returns string line of passwd file containing $id, FALSE if $id wasn't found, or PEAR_Error on failure.
Table 43-1. Possible PEAR_Error values
|FILE_PASSWD_E_EXISTS_NOT||passwd file doesn't exist|
|FILE_PASSWD_E_FILE_NOT_OPENED||passwd file couldn't be opened in read mode|
|FILE_PASSWD_E_FILE_NOT_LOCKED||passwd file couldn't be locked shared|
|FILE_PASSWD_E_FILE_NOT_UNLOCKED||passwd file couldn't be unlocked (only if auth fails)|
|FILE_PASSWD_E_FILE_NOT_CLOSED||passwd file couldn't be closed (only if auth fails)|